Abstract:      Since the implementation of the innovation driven development strategy, Beijing-Tianjin-Hebei region have paid more and more attention to regional innovation and development. Based on local advantages and actual needs of development, local governments at all levels have formulated preferential policies to support regional innovation activities and attract the inflow of innovation factors. With the promotion of innovation policy practice of local governments at all levels, the regional innovation policy system has become increasingly large and complex. The role of policy coordination in affecting regional innovation performance has become increasingly prominent, and the mutual cooperation between policies have an important impact on the realization of the effect of policy measures. According to the theory of new economic geography, factor mobility is conducive to the improvement of regional innovation performance. To clarify the mechanism of policy coordination, factor mobility and regional innovation performance, this paper makes an empirical analysis based on the panel data of 42 prefecture-level cities / districts of Beijing-Tianjin-Hebei region from 2013 to 2018. 
   The research data of this paper include two types: innovation policy text and statistical yearbook data. During the observation period, 1670 innovation policy texts are processed quantitatively by expert scoring method, and the degree of policy coordination is calculated by the coordination degree model of composite system. On this basis, the mixed OLS regression model is introduced to empirically examine the impact of innovation policy coordination on regional innovation performance, and the mediating effect of factor mobility is verified. The results show that: innovation policy coordination has a significant positive impact on regional innovation performance; factor mobility has a partial mediating effect in the relationship between innovation policy coordination and regional innovation performance; the mediating effect of human factors and capital factors in this process is basically the same.
   According to the results of empirical analysis, this paper puts forward the following practical recommendations for the development of regional innovation and policy coordination. 
   First, accelerate the establishment of a common market for innovation factors and remove obstacles to the flow of regional factors. The administrative relationship of Beijing-Tianjin-Hebei region is complex, and the resource allocation in the region is subject to administrative interference. Market segmentation restricts the formation of factor common market and hinders the free flow of innovation factors such as talent, capital and technology in the region. Therefore, we should speed up the establishment of a common factor market in the region, and optimize the division of work and cooperation among the local governments. Pay attention to the linkage construction of factor market and regional integration, and strengthen the integrated construction of transportation, information and other infrastructure. 
   Second, accelerate diversified capital flows and increase capital stock to promote regional innovation capacity. Local governments at all levels in Beijing-Tianjin-Hebei region should pay more attention to the development of diversified capital in the region. Encourage and support the development of private capital market, improve the activity of private capital through financial system reform and supporting policy promotion. 
    Third, strengthen policy cooperation among local governments in the region, and improve the quality of regional innovation policy. The coordination of innovation policy objectives and measures has a significant positive impact on regional innovation performance. Local governments should pay attention to the internal consistency of policy objectives and measures, and improve the coordination of regional innovation policy. In addition, due to the lag effect of policy coordination, the assessment and evaluation system of innovation policy need to be constructed to correct the problems of policy coordination in time.

Key words: policy coordination, factor mobility, regional innovation performance, mediating effect